As far I know an Administrator a/c is created(by default) when XP is installed. And this a/c can only be viewed in safe mode. This admin a/c is created for emergency use(in safe mode).
And u need to create another admin a/c(minimun) for administrating ur OS. Dat's y the delete option is not active for this a/c
And u shudn't del this a/c too.
Coz by default Administrator a/c will now show up in Welcome Screen. (Exception: Use of 3rd party s/w like TuneUP or Old switching screen where u need to type user a/c and passwd)
Well.........as for ur prblm. Go to Safe mode and enter to Administrator a/c(by default one) and copy all the data to some other drive.
And once u login through safe mode to this by default Administrator a/c all it's data will b available in My Computer>C

assuming)>Documents and Settings>Administrator.
So u can also switch to normal view(the admin a/c u created) and copy all its(Administrator) Desktop, My Documents etc etc. data from the path given avobe.
Well correct me if I'm wrong.